John XXIII, P. (1963). A prodigy of celestial grace: Address of His Holiness Pope John XXIII, March 17, 1963. National Catholic Welfare Conference.
Chicago-viite (17. p.)John XXIII, Pope. A Prodigy of Celestial Grace: Address of His Holiness Pope John XXIII, March 17, 1963. Washington, D.C.: National Catholic Welfare Conference, 1963.
MLA-viite (8. p.)John XXIII, Pope. A Prodigy of Celestial Grace: Address of His Holiness Pope John XXIII, March 17, 1963. National Catholic Welfare Conference, 1963.
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